Paste strip grouting combined filling mining method for coal mine goaf

Abstract

The invention provides a paste strip grouting combined filling mining method for a coal mine goaf. The method comprises the steps that 1, before working face stoping, a grouting roadway is tunneled above a working face; 2, paste filling mining is conducted in a filling area (1); 3, gob-side entry retaining is conducted in a transportation roadway of an unfilled area (2); 4, grouting drill holes are formed in the unfilled area (2) of the grouting roadway; 5, after the working face is pushed by a certain distance, grouting filling is conducted on the unfilled area (2) of the grouting roadway; and 6, the steps 2-5 are repeated till mining of a mining area is completed. According to the paste strip grouting combined filling mining method for the coal mine goaf, under protection of a filling hydraulic support, paste strip filling is conducted, and grouting filling is conducted on the unfilled area through the grouting roadway; and according to the method, pressed coal under the three conditions can be liberated, the coal recovery rate is increased, and the problem of emission of mine/power plant waste such as coal gangue/coal ash can be solved.

Description

technical field [0001] The invention belongs to the field of mining of coal and rock layers, and relates to a mining method of paste strip grouting combined filling in a goaf of a coal mine. Background technique [0002] At present, all mining areas in my country have different degrees of "three under" coal pressure problems. According to incomplete statistics, my country's production mines "three under" coal pressure reached 13.79 billion tons. Long-term coal mining has produced a large amount of coal gangue and other mine waste. At present, the accumulated coal gangue piled up in the country over the years is about 4.5 billion tons, and the accumulation is still increasing at a rate of 150 million tons to 200 million tons per year. and soil pollution to varying degrees. "Three-down" coal mining and coal gangue and other mine waste disposal are urgent problems to be solved in coal mining, and it is also one of the main ways to solve the contradiction between economic deve...

AI Technical Summary

Problems solved by technology

At present, paste filling has a better subsidence reduction effect in coal mine filling mining, while the traditional paste filling mining adopts all goaf filling, there is a relatively prominent contradiction between mining and filling in the filling face, the output of the filling face is low, and the mining efficiency is poor It is the main technical bottleneck of paste filling mining in many coal mines.

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